nuttx/graphics/nxglib/lcd/nxglib_setpixel.c

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/****************************************************************************
* graphics/nxglib/lcd/nxglib_setpixel.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <nuttx/lcd/lcd.h>
#include <nuttx/nx/nxglib.h>
#include "nxglib_bitblit.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef NXGLIB_SUFFIX
# error "NXGLIB_SUFFIX must be defined before including this header file"
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxgl_setpixel_*bpp
*
* Description:
* Draw a single pixel in LCD memory at the given position and with the
* given color. This is equivalent to nxgl_fillrectangle_*bpp() with a 1x1
* rectangle but is more efficient.
*
****************************************************************************/
void NXGL_FUNCNAME(nxgl_setpixel, NXGLIB_SUFFIX)
(
FAR struct lcd_planeinfo_s *pinfo,
FAR const struct nxgl_point_s *pos,
NXGL_PIXEL_T color)
{
#if NXGLIB_BITSPERPIXEL < 8
uint8_t shift;
uint8_t mask;
uint8_t pixel;
/* Read the byte that contains the pixel to be changed */
pinfo->getrun(pinfo->dev, pos->y, pos->x, &pixel, 8 / NXGLIB_BITSPERPIXEL);
/* Shift the color into the proper position */
# ifdef CONFIG_NX_PACKEDMSFIRST
# if NXGLIB_BITSPERPIXEL == 1
shift = (7 - (pos->x & 7)); /* Shift is 0, 1, ... 7 */
mask = (1 << shift); /* Mask is 0x01, 0x02, .. 0x80 */
color <<= shift; /* Color is positioned under the mask */
# elif NXGLIB_BITSPERPIXEL == 2
shift = (6 - ((pos->x & 3) << 1)); /* Shift is 0, 2, 4, or 6 */
mask = (3 << shift); /* Mask is 0x03, 0x0c, 0x30, or 0xc0 */
color <<= shift; /* Color is positioned under the mask */
# elif NXGLIB_BITSPERPIXEL == 4
shift = (4 - ((pos->x & 1) << 2)); /* Shift is 0 or 4 */
mask = (15 << shift); /* Mask is 0x0f or 0xf0 */
color <<= shift; /* Color is positioned under the mask */
# else
# error "Unsupported pixel depth"
# endif
#else /* CONFIG_NX_PACKEDMSFIRST */
# if NXGLIB_BITSPERPIXEL == 1
shift = (pos->x & 7); /* Shift is 0, 1, ... 7 */
mask = (1 << shift); /* Mask is 0x01, 0x02, .. 0x80 */
color <<= shift; /* Color is positioned under the mask */
# elif NXGLIB_BITSPERPIXEL == 2
shift = (pos->x & 3) << 1; /* Shift is 0, 2, 4, or 6 */
mask = (3 << shift); /* Mask is 0x03, 0x0c, 0x30, or 0xc0 */
color <<= shift; /* Color is positioned under the mask */
# elif NXGLIB_BITSPERPIXEL == 4
shift = (pos->x & 1) << 2; /* Shift is 0 or 4 */
mask = (15 << shift); /* Mask is 0x0f or 0xf0 */
color <<= shift; /* Color is positioned under the mask */
# else
# error "Unsupported pixel depth"
# endif
#endif /* CONFIG_NX_PACKEDMSFIRST */
/* Handle masking of the fractional byte */
pixel = (pixel & ~mask) | (color & mask);
/* Write the modified byte back to graphics memory */
pinfo->putrun(pinfo->dev,
pos->y,
pos->x,
(FAR uint8_t *)&pixel,
8 / NXGLIB_BITSPERPIXEL);
#else
/* Draw a single pixel at this position raster line at this row */
pinfo->putrun(pinfo->dev, pos->y, pos->x, (FAR uint8_t *)&color, 1);
#endif
}